Ruth was an 80's synth/artsy new wave group from France consisting of Thiery Müller, Phillippe Doray and Ruth Ellyeri. From what I can gather, they only released one full-length LP, also titled Polaroid/Roman/Photo on the ultra-obscure Paris Album records. The record was out of print for quite some time, but has since been reissued by UK label Infrastition Records. You can buy the CD reissue here, or if you want to go the digital route, you can buy the compilation that this track also appears on called Bipp: French Synth Wave 1979-1985 here